使用 SQL 在 Table 中拆分记录

Question

我有一个 table 有以下记录

PREFIX	BEGIN	END	DIV	INDUSTRY
1AB	00001	99999	LPSD	RI
1AB	00527	00528	MHUG	RI

我想拆分如下

PREFIX	BEGIN	END	DIV	INDUSTRY
1AB	00001	99999	LPSD	RI
1AB	00527	00528	MHUG	RI
1AB	00529	99999	LPSD	RI

如果你看到因为我们有一条前缀相同但开始和结束不同的记录，我想将第一条记录分成2条记录，一条从00001到00526，一条从00529到99999。

是否可以使用 SQL 查询

执行相同的操作

Answer 1

我认为这可行（但需要更大的数据集才能正确测试）：

SELECT prefix,
       "BEGIN",
       "END",
       CASE type
       WHEN 1
       THEN div
       ELSE LAG(CASE type WHEN 1 THEN div END) IGNORE NULLS
              OVER (PARTITION BY prefix, industry, grp ORDER BY "BEGIN")
       END AS div,
       industry
FROM   (
  SELECT prefix,
         div,
         industry,
         value AS "BEGIN",
         type,
         SUM(type) OVER (PARTITION BY prefix, industry ORDER BY value) AS grp,
         LEAD(value) OVER (PARTITION BY prefix, industry ORDER BY value) AS "END"
  FROM   table_name
  UNPIVOT (value FOR type IN ("BEGIN" AS 1, "END" AS -1))
)
WHERE  grp > 0
ORDER BY prefix, industry, "BEGIN";

其中，对于示例数据：

CREATE TABLE table_name (prefix, "BEGIN", "END", div, industry) AS
SELECT '1AB', '00001', '99999', 'LPSD', 'RI' FROM DUAL UNION ALL
SELECT '1AB', '00527', '00528', 'MHUG', 'RI' FROM DUAL;

输出：

PREFIX BEGIN END DIV INDUSTRY

1AB 00001 00527 LPSD RI

1AB 00527 00528 MHUG RI

1AB 00528 99999 LPSD RI

db<>fiddle here

Answer 2

首先，用保留字（如 Begin、End ...）命名列不是一个好习惯。这可以使用像这样的 MODEL 子句来解决...

    WITH
        tbl AS
            (   Select '1AB' "PRFX", '00001' "BGN", '99999' "ND", 'LPSD' "DV", 'RI' "IND" From Dual UNION ALL
                Select '1AB' "PRFX", '00527' "BGN", '00528' "ND", 'MHUG' "DV", 'RI' "IND" From Dual
            ) 
    SELECT DISTINCT
        m.*,
        t.DV "DV",
        t.IND "IND"
    FROM
        (
    SELECT
        INDX,
        PRFX, BGN, ND
    FROM
        (   SELECT
                PRFX "PRFX",
                LISTAGG(BGN, ',') WITHIN GROUP (ORDER BY PRFX, BGN) "BGN",
                LISTAGG(ND, ',') WITHIN GROUP (ORDER BY PRFX, ND) "ND"
            FROM
                tbl 
            GROUP BY
                PRFX
        )
    MODEL
        DIMENSION BY(0 as INDX)
        MEASURES (PRFX, BGN, ND)
            RULES ITERATE(3) 
                (   PRFX[ITERATION_NUMBER+1] = PRFX[0],
                    BGN[ITERATION_NUMBER+1] = Nvl(SubStr(REPLACE(BGN[0], ',', ''), (ITERATION_NUMBER*5) + 1, 5), LPAD(To_Number(SubStr(REPLACE(ND[0], ',', ''), ((ITERATION_NUMBER-2)*5) + 1, 5)) + 1, 5, '0')),
                    ND[ITERATION_NUMBER+1] = CASE 
                                                WHEN SubStr(REPLACE(BGN[0], ',', ''), ((ITERATION_NUMBER+1)*5) + 1, 5) < SubStr(REPLACE(ND[0], ',', ''), (ITERATION_NUMBER*5) + 1, 5) THEN
                                                    LPAD(To_Number(SubStr(REPLACE(BGN[0], ',', ''), ((ITERATION_NUMBER+1)*5) + 1, 5)) - 1, 5, '0')
                                              ELSE 
                                                  SubStr(REPLACE(ND[0], ',', ''), ((ITERATION_NUMBER-1)*5) + 1, 5) 
                                              END
                )
        ) m
    LEFT JOIN
        (   SELECT 
                PRFX, DV, 
                IND, 
                Max(ND) OVER(PARTITION BY PRFX, DV ORDER BY PRFX, DV) "MAX_ND",
                Min(BGN) OVER(PARTITION BY PRFX, DV ORDER BY PRFX, DV) "MIN_BGN"
            FROM 
                tbl
        )  t ON (t.PRFX = m.PRFX And (t.MAX_ND = m.ND OR t.MIN_BGN = m.BGN)) 
WHERE
    m.INDX > 0 And ND Is Not Null
ORDER BY 
    m.INDX
    --
    -- Result
    -- INDX PRFX BGN    ND      DV      IND
    -- 1    1AB  00001  00526   LPSD    RI
    -- 2    1AB  00527  00528   MHUG    RI
    -- 3    1AB  00529  99999   LPSD    RI

希望对您有所帮助。问候...

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